ASTM B564 UNS N04400 Weld Neck Flange Monel 400 WNRTJ Flange Ring Type Joint Flanges
ASTM B 564 UNS N04400 Nickel Alloy Flange Monel 400 Weld Neck Flange
The ASTM B564 UNS N04400 Weld Neck Flange is a forged nickel-copper alloy flange made from Monel 400 / UNS N04400. It has a Weld Neck (WN) design with a Ring Type Joint (RTJ) facing, often abbreviated as WNRTJ. The flange is butt-welded to pipe, and the RTJ face uses a metal ring gasket to provide a high-integrity seal in high-pressure and high-temperature service. It is widely used in marine, chemical, petrochemical, oil and gas, and power generation industries.
Equivalent Material of ASTM B564 UNS N04400 Weld Neck Flange Monel 400 WNRTJ Flange Nickel Alloy Flange
| STANDARD | UNS | WERKSTOFF NR. | AFNOR | EN | JIS | BS | GOST |
| Monel 400 | N04400 | 2.4360 | NU-30M | NiCu30Fe | NW 4400 | NA 13 | -- 28-2,5-1,5 |
When to choose Monel 400 / UNS N04400 material
Choose Monel 400 when you need a nickel-copper alloy with excellent corrosion resistance and good strength in aggressive environments where carbon steel, stainless steel (304/316), or even some duplex grades may fail.
Choose RTJ (Ring Type Joint) instead of FF/RF when:
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High pressure
Typically Class 900, 1500, 2500, and often critical Class 600 service. -
High temperature
Where soft or spiral-wound gaskets may creep, degrade, or lose sealing force. RTJ metal ring gaskets are more reliable at elevated temperatures. -
Hazardous, toxic, or flammable fluids
Hydrogen, sour gas, high-pressure steam, hydrocarbons, ammonia, and other services where leakage is unacceptable. -
High cyclic loading, vibration, or thermal cycling
The confined metal ring gasket resists blowout and creep better than soft gaskets. -
Fire-safe requirements
Metal ring gaskets perform better in fire conditions than many soft gaskets. -
Offshore, subsea, wellhead, and API 6A equipment
RTJ is standard for many high-pressure oil and gas applications. -
Space and weight savings at high pressure
For high classes, RTJ flanges can be more compact than RF flanges.
Chemical Properties of ASTM B564 UNS N04400 Weld Neck Flange Monel 400 WNRTJ Flange Nickel Alloy Flange
| Monel 400 | Ni | C | Al | Mn | Si | Fe | Cu | S | Co | Cr |
| 63.0 min | 0.3 max | 0.50 max | 2.0 max | 0.5 max | 1.0 – 2.5 | 28.0 – 34.0 | 0.02 max | – | – |
Mechanical Characteristics of ASTM B564 UNS N04400 Weld Neck Flange Monel 400 WNRTJ Flange Nickel Alloy Flange
| Density | Melting Point | Yield Strength (0.2%Offset) | Tensile Strength | Elongation |
| 8.8 g/cm3 | 1350 °C (2460 °F) | Psi - 35,000 , MPa - 240 | Psi - 80,000 , MPa - 550 | 40 % |
ASTM B564 UNS N04400 Nickel Alloy Flange
| Specifications |
ASTM/ ASME B564 / SB564 |
|---|---|
| Dimension Standard | ANSI /ASME B16.5, B16.47 Series A / Series B |
| Size Chart | 1/2″up to 48″ (15 - 1200NB) |
| Class / Pressure Rating | 2500#, 600#, 150#, 300#, 900#, 1500# |
| Flange Face | FF, RF, RTJ |
| Flange Type | Weld Neck, Blind, Slip on, Socket, Thread, Long Weld Neck ... |
Penetration Test
Application
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Marine and offshore: seawater piping, heat exchangers, pumps, valves.
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Chemical processing: reactors, tanks, piping for acids and alkalis.
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Oil and gas: high-pressure piping, wellhead equipment, sour service.
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Power generation: feedwater heaters, condensers.
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Pulp and paper, salt production, and nuclear fuel processing.
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